<template>
  <div class="app-container">

      <!--顶部header区域-->
      <mt-header fixed title="黑马程序员-Vue项目">
         <span slot="left" @click="goBack" v-show="flag">
           <mt-button icon="back">返回</mt-button>
         </span>
      </mt-header>

      <!--中间的路由 router-view区域-->
      <transition>
          <router-view></router-view>
      </transition>


      <!--底部tabbar区域-->
      <nav class="mui-bar mui-bar-tab">
          <router-link class="mui-tab-item-llb" to="/home">
              <span class="mui-icon mui-icon-home"></span>
              <span class="mui-tab-label">首页</span>
          </router-link>
          <router-link class="mui-tab-item-llb" to="/member">
              <span class="mui-icon mui-icon-contact"></span>
              <span class="mui-tab-label">会员</span>
          </router-link>
          <router-link class="mui-tab-item-llb" to="/shopcar">
              <span class="mui-icon mui-icon-extra mui-icon-extra-cart">
                  <span class="mui-badge" id="badge">{{ $store.getters.getAllCount }}</span>
              </span>
              <span class="mui-tab-label">购物车</span>
          </router-link>
          <router-link class="mui-tab-item-llb" to="/search">
              <span class="mui-icon mui-icon-search"></span>
              <span class="mui-tab-label">搜索</span>
          </router-link>
      </nav>

  </div>
</template>

<script>
    export default {
        data() {
            return {
                flag: false
            };
        },
        created() {
            this.flag = this.$route.path === "/home" ? false : true;
        },
        methods: {
            goBack() {
                // 点击后退
                this.$router.go(-1);
            }
        },
        watch: {
            "$route.path": function(newVal) {
                if (newVal === "/home") {
                    this.flag = false;
                } else {
                    this.flag = true;
                }
            }
        }
    };
</script>

<!--使用局部的样式-->
<style lang="scss" scoped>
    .mint-header{
        z-index:99;
    }
.app-container {
    padding-top: 40px;
    padding-bottom: 50px;
    overflow-x: hidden;
}

.v-enter {
    opacity: 0;
    transform: translateX(100%);
}

.v-leave-to {
    opacity: 0;
    transform: translateX(-100%);
    position: absolute;
}

.v-enter-active,
.v-leave-active {
    transition: all 0.5s ease;
}

// 该类名，解决 tabbar 点击无法切换的问题
.mui-bar-tab .mui-tab-item-llb.mui-active {
    color: #007aff;
}

.mui-bar-tab .mui-tab-item-llb {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
}

.mui-bar-tab .mui-tab-item-llb .mui-icon {
    top: 3px;
    width: 24px;
    height: 24px;
    padding-top: 0;
    padding-bottom: 0;
}

.mui-bar-tab .mui-tab-item-llb .mui-icon~.mui-tab-label {
    font-size: 11px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
}
</style>